pfanstiehl



C. PFANSTIEHL. METHOD 0F COMPRESSING TUNGSTEN POWDER. APPLICATION rlLzuKMmzs. 191B. 153055975. Patented June 3,1919. v2 sHEgTs-sHE`ET 1.

'CQ PFANSTIEHL.

METHOD 0F COMPRESSING TUNGSTEN POWDER. APPL-ICATIQN FILED JAN.26. |918.

1,305,975. I Patented Jun 3, 1919.

2 'SHEETS-SHEET 2.

@J i; f f4 ma@ y 70M dq UNITED STATES .PATENT OFFICE.

. CARL PFANSTIEHL, F HIGHLAND PARK, ILLINOIS, ASSIGNOR T0 PFANSTIEHL `GOMPANY, INC., OF NORTH CHICAGO, ILLINOIS, A CORPORATION 0F NEW roux.

' Specification of Letters Patent.

OF COMPRES'SING TUNGSTEN POWDER Patented June 3, 1919.

Original application led October 9, 1916, Serial No. 124,504. Divided and this application-med January 26, 1918. Serial No. 213,906.

' Toall whom t may concer/n: i

Be it known that I CARL PFANSTIEHL, a citizen of the United States, residing at Highland Park, in the county of Lake and State of Illinois, have invented a certain new and useful Improvement in Methods of Com ressing Tungsten Powder, of lwhich the ollowing is a full, clearv concise, and exact description, reference being had to the accompanying drawings, forming a part' of this spec' cation.

My lnvention relates to the art of compressing tungsten powder` to form bodies or ingots'o'f tungsten that may be readily handled, machined, sintered, etc., in various processes of converting tungsten into manu- Y factured products. This application is a division of my application Serial No. 124,504, led October 9, 1916, for means and method for compressing tungsten powder. The improvements which characterize my present invention are particularly useful in producing the articles of tungsten having a high density as described and claimedin my co-.pending application Serial No. 113,323, iiled August 5, 1916.

In producing compressed tungsten powder ingots of the class described and claimed in my co-pending application Serial No. 113,323, fine tungsten or tantalum powder 1s subJected to a-pressure of substantially 135 tons lor more per square inch. The greater the pressure employed 1n compressing the `tungstenpowder the greater is thefdensltyof the finished product. However, when tungsten powder is subjected to such enormous A pressure as 130 to 160 tons to the square inch,

as my resent inventionh contemplates, serii .ous` di culties are encountered when .the

pressure is relieved due to the fact that the compressed powder tends to liy apart or crumble away. My present inventlon enables me to subject tungsten powder to enormous pressures and at the same time to secure enormous pressure utilized in its formation I permit the com ressed tungsterr owder to expand substantially equally in a directions. By so doingI ind that the compressed tungsten powder does not crumbleor fall apart `when the pressure -is relieved therefrom.

efect-mgots, principally for the 'reai son t at when I relieve the ingot from the l23 riding on corresponding l blocks 16 and 17. The pieces 21 andd v.me-H 1ber of the apparatus for compressing the powdered tungsten into ingot form;

Fig. 2 is a vertical cross sectional view taken along the line 2-2 of Fig. 1 looking in dthe direction indicated by the arrows; an

Fig. 3' is a vertical cross sectional view 65 taken along the lines 3-3 of Fig. 1 looking in the direction indicated by the arrow.

Similar characters of reference referto similar parts throughout the several views.

Referring rst t0 Fig. 2, 4 illustrates the 70 lower die member and 5 the upper die member of the apparatus for compressing the powdered tungsten into ingot form. The upper -die 'member consists of a 'supporting plate 6 attached to suitable mechanism for l5 lowering and raising itinto and away from the base die 4. The plate 6 carries a block 7 secured to the former by means of the screws illustrated at 8 8.. A slot isprovided at .9 in the block 7 in which is held by means of 80 the screws 10-10 theupper die member 11. This die-member 11 is arranged to be in.- serted into the slot 12 .provided in the base die V4, which slot contains the powdered tungsten to be compressed.

The die 4 is composed of the base 13 provided with the downwardly tapered opening 14 located on its upper side. ,A strip 15 is centrally located in the opening 14 ,and serves as the bottom or base for'the slot or 90 opening '12 in which the powdered tungsten is compressed. The side walls of the opening 12 are formed by the movable blocks or dies 16 and 17 each provided with an oblique side face 18 arranged to ride vertically on 95 the side wall of the opening 14.

The blocks 16- and. 17 `are normally re. tained in the position illustrated in Fi .l 2 by means of the strips 19 secured t0 the asc member 13 by'means of the, screws-illus- 100y trated at 20-20. The end walls of the slot-A or openin 12 are formed by the pieces 21` and 22, w ich, as most clearly illustrated in. Fig. 3, are provided with the oblique faces faces of the 'l l 22, like theiblocks or dies 16 nd 17, are

arranged to have vertical movement on their oblique faces when the strips 19 are raised. The operation of the Adevice is as follows:

The powdered tungsten orA ltantalum is vWhen this enormous pressure 1s relieved from the ingot it is necessary to relieve the pressurein such manner as to permit the ingot to expand equally in all directions otherwise the ingot will crumble away or 4ily apart. To provide for this uniform expansion of the'mgot when the pressure is removed the expansible die member 4 is utilized.

After the tungsten powder has been subjected to suicient pressure to convert it -into a solid ingot the upper die member 11 is slightly raised.` At the same time however that the upper die member 11 is raised the strips 19-19 are released by turning the screws 20 to permitfthe blocks 16 and 17 and the end pieces 2-1 and ,22 to move upwardly.

v The upward movement of the members 16 17, 21, and 22, due to their oblique riding? faces, causes them to spread outwardly with the result that the ingot is not only permitted to expand upwardly as the die member 11 is removed, but is permitted also to expand laterally, in all directions, the pressure of the ingot, of course,serving to cause movement of the members 16, 17, 21 and 22 in the aforesaid upward direction.

Having thus described my invention, what I claim as new and desire to secure by United States Letters Patent is:

1. The.. methodv of compressing tungsten powder which consists in applying pressure tothe powder andthen relieving pressure therefrom so as to permit the compressed powder to expand substantially equally in all directions. Y

2. rll`he process of forming ingots -of metal powder which comprises subjectin the metal powder while inclosed on all si es to a pressure suiicient to substantially permanently deform the particles of metal powder and then allowing the in ot to expand substantially uniformly in a directions.

3. The process of forming in ts of metal powder which comprises su )ecting the metal powder to a pressure sufficient to substantially of metal powder.

4. The process of forming ingots of tungsten which comprises subjecting the tungsten powder to a pressure of substantially 135 tons per square inch and then allowmg` the ingot to expand uniformly m all dlrections.

{In witness whereof, I hereunto4 subscribe my name this' 17th day of January, 1918.

CARL PFANSTIEHL;

Witnesses:

W. O. BELL MAnGARnr RoBBEN.

permanently deform the particles 

